Toprol-XL and allergic to sulfa

A pharmacist heard my breathing and told me I was over medicated. My doctors prescribed 20/12.5 Benicar, olmesmartan, twice a day for systemic hbp and Toprol once a day for pulmonary hypertension. I gradually stopped taking the Benicar because I could barely function, felt like I had been beaten down all day, had the sharp pains from one point to another and couldn't remember anything short term. I'm also allergic to sulfa which is an ingredient in olmesmartan. I'm only taking Toprol. I feel 200% better. The "charlie horses" aren't nearly as bad and the sharp pains and muscle tenderness are gone. My short term memory is better as well. I drink lots of water and take a potassium supplement. As a result, I retain much less fluid.